Method of performing actions related to handover by a mobile station that is in power saving mode in a wireless mobile communication system

Abstract

A method of performing actions related to handover by a mobile station (MS) in a wireless mobile communication system is disclosed. More specifically, the MS receives information from a base station (BS), wherein the information includes at least one action for performing handover and at least one condition corresponding to the at least one action. Furthermore, the MS transmits a request message to perform the at least one action based on the received information from the BS and receives a response message in response to the request message. Lastly, the MS performs the at least one action according to the received response message.

1. A method for supporting a sleep mode action of a mobile station (MS) in a wireless mobile communication system, the method comprising:
 receiving, in the MS, a first message comprising trigger information, wherein the trigger information includes at least one trigger condition and at least one event action comprising a handover action which is performed upon reaching the at least one trigger condition; 
 transmitting, from the MS, a sleep request message comprising a first enabled triggered parameter, wherein the first enabled triggered parameter includes a first bitmap comprising a first bit which is set to indicate the handover action is enabled; 
 receiving, in the MS, a sleep response message comprising a second enabled triggered parameter, wherein the second enabled triggered parameter includes a second bitmap comprising a second bit which is set to indicate the handover action is enabled; 
 entering, by the MS, a sleep mode after receiving the sleep response message; 
 transmitting, from the MS, a handover request message when the at least one trigger condition corresponding to the handover action is reached in the sleep mode; and 
 receiving, in the MS, a handover response message in response to the handover request message. 
 
     
     
       2. The method of  claim 1 , wherein the trigger information further includes a trigger type field defined as at least a Carrier-to-Interference and Noise Ratio (CINR), a Received Signal Strength Indicator (RSSI), or a Round Trip Delay (RTD). 
     
     
       3. The method of  claim 1 , wherein the trigger information defines a trigger function which is a computation method for triggering the at least one event action. 
     
     
       4. The method of  claim 1 , wherein the first bit of the first bitmap is configured to a third bit of the first bitmap and the second bit of the second bitmap is configured to a fourth bit of the second bitmap. 
     
     
       5. The method of  claim 1 , further comprising:
 transmitting, from the MS, a handover indication message indicating that the MS is about to perform the handover action to a target base station. 
 
     
     
       6. The method of  claim 1 , wherein the first message is a Downlink Channel Descriptor (DCD) message or a Neighbor Advertisement message. 
     
     
       7. A method for supporting a sleep mode action at a base station (BS) in a wireless mobile communication system, the method comprising:
 transmitting, from the BS, a first message comprising trigger information, wherein the trigger information includes at least one trigger condition and at least one event action comprising a handover action which is performed upon reaching the at least one trigger condition; 
 receiving, in the BS, a sleep request message comprising a first enabled triggered parameter, wherein the first enabled triggered parameter includes a first bitmap comprising a first bit which is set to indicate the handover action is enabled; 
 transmitting, from the BS, a sleep response message comprising a second enabled triggered parameter, wherein the second enabled triggered parameter includes a second bitmap comprising a second bit which is set to indicate the handover action is enabled; 
 receiving, in the BS, a handover request message when a trigger condition corresponding to the handover action is reached in a sleep mode; and 
 transmitting, from the BS, a handover respond message in response to the handover request message. 
 
     
     
       8. The method of  claim 7 , wherein the trigger information further includes a trigger type field defined as at least a Carrier-to-Interference and Noise Ratio (CINR), a Received Signal Strength Indicator (RSSI), or a Round Trip Delay. 
     
     
       9. The method of  claim 7 , wherein the trigger information defines a trigger function which is a computation method for triggering the at least one event action. 
     
     
       10. The method of  claim 7 , wherein the first bit of the first bitmap is configured to a third bit of the first bitmap and the second bit of the second bitmap is configured to a fourth bit of the second bitmap. 
     
     
       11. The method of  claim 7 , further comprising:
 receiving, in the BS, a handover indication message indicating that a mobile station is about to perform the handover action to a target base station. 
 
     
     
       12. The method of  claim 7 , wherein the first information is a Downlink Channel Descriptor (DCD) message or a Neighbor Advertisement message. 
     
     
       13. A mobile station performing a sleep mode action in a wireless mobile communication system, wherein the mobile station is configured for:
 receiving a first message comprising trigger information, wherein the trigger information includes at least one trigger condition and at least one event action comprising a handover action which is performed upon reaching the at least one trigger condition; 
 transmitting a sleep request message comprising a first enabled triggered parameter, wherein the first enabled triggered parameter includes a first bitmap comprising a first bit which is set to indicate the handover action is enabled; 
 receiving a sleep response message comprising a second enabled triggered parameter, wherein the second enabled triggered parameter includes a second bitmap comprising a second bit which is set to indicate the handover action is enabled; 
 entering a sleep mode after receiving the sleep response message; 
 transmitting a handover request message when the at least one trigger condition corresponding to the handover action is reached in the sleep mode; and 
 receiving a handover response message in response to the handover request message. 
 
     
     
       14. The mobile station of  claim 12 , wherein the trigger information further includes a trigger type field defined as at least one of Carrier-to-Interference and Noise Ratio (CINR), a Received Signal Strength Indicator (RSSI), and a Round Trip Delay (RTD). 
     
     
       15. The mobile station of  claim 13 , wherein the first bit of the first bitmap is configured to a third bit of the first bitmap and the second bit of the second bitmap is configured to a fourth bit of the second bitmap. 
     
     
       16. The mobile station of  claim 13 , further configured for:
 transmitting a handover indication message indicating that the MS is about to perform the handover action to a target base station. 
 
     
     
       17. The mobile station of  claim 13 , wherein the first message is a Downlink Channel Descriptor (DCD) message or a Neighbor Advertisement message. 
     
     
       18. A base station (BS) supporting a sleep mode action in a wireless mobile communication system, wherein the base station is configured for:
 transmitting a first message comprising trigger information, wherein the trigger information includes at least one trigger condition and at least one event action comprising a handover action which is performed upon reaching the at least one trigger condition; 
 receiving a sleep request message comprising a first enabled triggered parameter, wherein the first enabled triggered parameter indicates a handover action; 
 transmitting a sleep response message comprising a second enabled triggered parameter, wherein the second enabled triggered parameter indicates the handover action; 
 receiving a handover request message when a trigger condition corresponding to the handover action is reached in a sleep mode; and 
 transmitting a handover response message in response to the handover request message. 
 
     
     
       19. The base station of  claim 18 , wherein the trigger information further includes a trigger type field defined as at least a Carrier-to-Interference and Noise Ratio (CINR), a Received Signal Strength Indicator (RSSI), or a Round Trip Delay (RTD). 
     
     
       20. The base station of  claim 18 , wherein:
 the first enabled trigger parameter includes a first bitmap comprising a first bit and the second enabled trigger parameter includes a second bitmap comprising a second bit, and 
 the first and second bits are set to indicate that the handover action is enabled, and wherein the first bit is configured to a third bit of the first bitmap and the second bit is configured to a fourth bit of the second bitmap. 
 
     
     
       21. The base station of  claim 18 , further configured for:
 receiving a handover indication message indicating that a mobile station is about to perform the handover action to a target base station. 
 
     
     
       22. The base station of  claim 18 , wherein the first message is a Downlink Channel Descriptor (DCD) message or a Neighbor Advertisement message.